03型复合材料中组元性能对其压电性能影响的研究

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1、ABSTRACT0-3piezo-compositescompriseceramicpowderandthree-dimensionalpolymer．Theyexhibitmanyadvantates，suchaslowbrittleness，lowdensityandlowpermittivity．Butthelowpiezoelectricityofcompositeslimitsitsapplication．Inordertoimprovepiezoelectricproperties，theceramicsandtheth

2、irdcomponentofcompositeswerestudied．ThetheoreticalDilutemodelWa3setup，andthepropertiesofcompositeswereanalyzed．Accordingtothismodel，somefactorsthataffectthecomposites’propertieswerefoundout，suchasthesize，permittivity,andpiezoelectricityofceramicpowder．nlepermittivityof

3、thecomponentsaffectsthedistributionofelectricfielddirectly．Incomposites，thecomponentsoflowpermittivitycouldproducehighelectricfield．Avalidwaytoenhanceelectricfieldinceramicparticlesistoreducethepermittivityofceramicortoimprovethatofpolymermatrix．Theperrnittivityofceram

4、icscouldbereducedbydopingsomeingredients．However,becauseofthelowpermittivityofpolymers，thethirddopantwasadded．Finally,thecompositeswithhighpiezoelectricconstantWCl'eobtained．Theshapeofceramicpowderisanotherimportantfactorthatinfluencespiezoelectricconstantofcomposites．

5、Simplyreducingtheparticlesizeofceramicpowderisuselesstoincreasepiezoelectricity．Throughmixingdifferentsizesofpowderuniformly,smallerparticlescouldfiIlintheinterspaceformedbybiggerparticles．Tlliswillimprovethepiezoelectricityof0-3compositesandthemaximalcontentofceramic．

6、Inthispaper,piezoelectricceramicswithlowpermittivityand0-3compositeswereprepared，meanwhiletheprocessweredetermined．Poly-anilinewaspreparedandaddedintocomposites舔themirddopant．AtlastthecompositesWerepolarizedatacertaintemperatureandelectricfield．n塘propertytestshowsthatt

7、hepiezoelectricityofcompositesisenhancedbyutilizingceramicpowderswitlllowpermittivityandgoodsizedistributionandproperadditionofPoly-aniline，Keywords：0-3composites,Piezoelectricconstant，Permittivity,Particlesize，PAn武汉理工大学硕士学位论文第一章绪论上世纪70年代以来，由于电子、通讯和控制等高科技含量行业的迅速崛起，人们对材

8、料的高性能、多功能、复合化等的需求越来越高，一种新材料——智能材料也因此受到了人们的青睐。智能材料能够感知环境变化，并通过自我判断和结果而实现指令和执行的新材料，具有类生物功能。目前，可作为智能材料系统中执行的材料主要有压电材料、磁致